<template>
  <div>
    <div id="app">
      <ol>
        <li v-for="(site, index) in sites">
          {{ index }} -{{ site.text }}
        </li>
      </ol>
    </div>
  </div>
</template>
<script>
const app = {
  data() {
    return {
      sites: [
        { text: 'Google' },
        { text: 'Runoob' },
        { text: 'Taobao' }
      ]
    }
  }
}

Vue.createApp(app).mount('#app')
</script>